Combine maple syrup, chili sauce, apple cider vinegar and country dijon mustard together in saucepan. Let simmer for 5 minutes. Brush chicken with the oil and season with salt and pepper. Add prepared wood chips to your grill fire. Place chicken on grill and cook for 10-15 minutes or until fork tender. Turn once and brush generaously with sauce in the last 5 minutes before tehy are done.